diff --git a/src/bindings/capi/thorvg_capi.h b/src/bindings/capi/thorvg_capi.h
index fbe8544a..e3f86760 100644
--- a/src/bindings/capi/thorvg_capi.h
+++ b/src/bindings/capi/thorvg_capi.h
@@ -2063,7 +2063,10 @@ TVG_API Tvg_Result tvg_scene_remove(Tvg_Paint* scene, Tvg_Paint* paint);
  *
  * @since 1.0
  */
-TVG_API Tvg_Result tvg_scene_push_effect(Tvg_Paint* scene, Tvg_Scene_Effect effect, ...);
+
+TVG_API Tvg_Result tvg_scene_reset_effects(Tvg_Paint* scene);
+
+TVG_API Tvg_Result tvg_scene_push_drop_shadow(Tvg_Paint* scene, int r, int g, int b, int a, double angle, double distance, double sigma, int quality);
 
 /** \} */   // end defgroup ThorVGCapi_Scene
 
diff --git a/src/bindings/capi/tvgCapi.cpp b/src/bindings/capi/tvgCapi.cpp
index 2adc7ebf..e8ac3f58 100644
--- a/src/bindings/capi/tvgCapi.cpp
+++ b/src/bindings/capi/tvgCapi.cpp
@@ -29,6 +29,8 @@
 #include <thorvg_lottie.h>
 #endif
 
+#include <iostream>
+
 using namespace std;
 using namespace tvg;
 
@@ -785,14 +787,21 @@ TVG_API Tvg_Result tvg_scene_remove(Tvg_Paint* scene, Tvg_Paint* paint)
     return TVG_RESULT_INVALID_ARGUMENT;
 }
 
-
-TVG_API Tvg_Result tvg_scene_push_effect(Tvg_Paint* scene, Tvg_Scene_Effect effect, ...)
+TVG_API Tvg_Result tvg_scene_reset_effects(Tvg_Paint* scene)
 {
     if (scene) {
-        va_list args;
-        va_start(args, effect);
-        Tvg_Result result = (Tvg_Result) reinterpret_cast<Scene*>(scene)->push(static_cast<SceneEffect>(effect), args);
-        va_end(args);
+        std::cout << "reset:scene:effects:reset" << std::endl;
+        Tvg_Result result = (Tvg_Result) reinterpret_cast<Scene*>(scene)->push(SceneEffect::ClearAll);
+        std::cout << "reset:scene:effects:reset:result:" << result << std::endl;
+        return result;
+    }
+    return TVG_RESULT_INVALID_ARGUMENT;
+}
+
+TVG_API Tvg_Result tvg_scene_push_drop_shadow(Tvg_Paint* scene, int r, int g, int b, int a, double angle, double distance, double sigma, int quality)
+{
+    if (scene) {
+        Tvg_Result result = (Tvg_Result) reinterpret_cast<Scene*>(scene)->push(static_cast<SceneEffect>(SceneEffect::DropShadow), r, g, b, a, angle, distance, sigma, quality);
         return result;
     }
     return TVG_RESULT_INVALID_ARGUMENT;
diff --git a/src/renderer/tvgRender.h b/src/renderer/tvgRender.h
index 46bd0e82..e761a8bf 100644
--- a/src/renderer/tvgRender.h
+++ b/src/renderer/tvgRender.h
@@ -28,6 +28,7 @@
 #include "tvgCommon.h"
 #include "tvgArray.h"
 #include "tvgLock.h"
+#include <iostream>
 
 namespace tvg
 {
@@ -339,6 +340,7 @@ struct RenderEffectDropShadow : RenderEffect
 
     static RenderEffectDropShadow* gen(va_list& args)
     {
+        std::cout << "gen:drop shadow" << std::endl;
         auto inst = new RenderEffectDropShadow;
         inst->color[0] = va_arg(args, int);
         inst->color[1] = va_arg(args, int);
@@ -349,6 +351,12 @@ struct RenderEffectDropShadow : RenderEffect
         inst->sigma = std::max((float) va_arg(args, double), 0.0f);
         inst->quality = std::min(va_arg(args, int), 100);
         inst->type = SceneEffect::DropShadow;
+        std::cout << "gen:drop shadow:color:" << (int)inst->color[0] << "," << (int)inst->color[1] << "," << (int)inst->color[2] << "," << (int)inst->color[3] << std::endl;
+        std::cout << "gen:drop shadow:angle:" << inst->angle << std::endl;
+        std::cout << "gen:drop shadow:distance:" << inst->distance << std::endl;
+        std::cout << "gen:drop shadow:sigma:" << inst->sigma << std::endl;
+        std::cout << "gen:drop shadow:quality:" << (int)inst->quality << std::endl;
+        std::cout << "gen:drop shadow:end" << std::endl;
         return inst;
     }
 };